PdfSharp 6.2.3's PdfDocument.Save() unconditionally stamps a page-level /Group {/S /Transparency /CS /DeviceRGB} onto every output page, even when the source page has none.

[gurj-dev]

If you think there is a bug in PDFsharp then please use the IssueSubmissionTemplate to make the issue replicable.
https://docs.pdfsharp.net/General/Issue-Reporting.html

Thanks.

Resources

The official project web site:
https://docs.pdfsharp.net/

The official peer-to-peer support forum:
http://forum.pdfsharp.net/

Reporting an Issue Here

Expected Behavior

Actual Behavior

Steps to Reproduce the Behavior

We strongly recommend using the IssueSubmissionTemplate to make sure we can replicate the issue.
https://docs.pdfsharp.net/General/Issue-Reporting.html